Piston structure of magnetorheological damper and magnetorheological damper

Abstract

The piston structure comprises a piston rod and a piston assembly connected to the piston rod, and the piston assembly comprises a piston shell, a piston body arranged in the piston shell in a sleeved mode and a piston coil arranged on the piston body in a sleeved mode. The two piston coils form one group and are at least two groups, the two groups of piston coils are arranged at intervals in the vertical direction of the piston body, a piston gap for magnetorheological fluid to flow is formed between the piston shell and the piston body, a top cover and a bottom cover are arranged at the top end and the bottom end of the piston shell respectively, a first circulation hole is formed in the top cover, and a second circulation hole is formed in the bottom cover. The first circulation hole, the second circulation hole and the piston are arranged in a clearance communication mode, the shock absorber is controlled by the two sets of coils, the stability and reliability of the shock absorber are improved, more precise control over current can be achieved through the design of the multiple sets of piston coils, multi-stage control over the magneto-rheological shock absorber is achieved, and the damping adjusting range can be enlarged.

Description

TECHNICAL FIELD

[0001] The utility model relates to magnetorheological damper technical field especially relates to a piston structure of magnetorheological damper and magnetorheological damper. BACKGROUND

[0002] At present, the traditional passive suspension damper is widely used in domestic automobile, the damping coefficient and spring stiffness of this damper are fixed, cannot play a good damping effect, and an ideal isolation system can be obtained in theory in active suspension, realizes ideal suspension control target, but its energy consumption is big, cost is high, and the structure is complex, the cylinder type magnetorheological damper in semi-active suspension effectively solves the contradiction between comfort and stability existing in passive suspension, and also approaches the performance of active suspension in control effect, and the structure is simple, and the price is relatively cheap, and it is not necessary to provide additional energy and can produce a variety of damping force, and in multiple working conditions, the comfort of riding and the stability of operation can be better considered.In these cylinder type magnetorheological dampers in semi-active suspension, the piston structure is a key component.

[0003] The existing piston structure is usually single-coil design, which limits the gap between the coil and the sleeve, and cannot meet the demand of smaller minimum damping and larger maximum damping, and the single-coil magnetic field width is small, resulting in that the magnetorheological fluid is not fine enough in damping force adjustment, and the low-speed damping force cannot be very low, at least above 100N. UTILITY MODEL CONTENTS

[0004] The utility model discloses a stable and reliable piston structure of magnetorheological damper and magnetorheological damper.

[0005] In order to achieve the above object, the utility model adopts the following technical scheme: a piston structure of magnetorheological damper, wherein the magnetorheological damper includes a cylinder assembly, the piston structure includes a piston rod and a piston assembly connected to the piston rod, the piston assembly includes a piston shell, a piston body sleeved in the piston shell and a piston coil sleeved on the piston body, two piston coils form a group and at least two groups are provided, the two groups of piston coils are arranged in the up-down direction of the piston body, a piston gap for the flow of magnetorheological fluid is formed between the piston shell and the piston body, a top cap and a bottom cap are respectively arranged at the top end and the bottom end of the piston shell, a first flow-through hole is arranged on the top cap, a second flow-through hole is arranged on the bottom cap, and the first flow-through hole, the second flow-through hole and the piston gap are arranged in communication.

[0006] In one embodiment, the piston body includes a first piston body and a second piston body, the piston coil includes a first group of piston coils and a second group of piston coils, the first group of piston coils is arranged on the first piston body, and the second group of piston coils is arranged on the second piston body.

[0007] One of the embodiments, the first group of piston coil includes a first coil and a second coil, the first piston body is provided with first groove and second groove which are arranged in upper and lower interval, the first coil and the second coil are arranged on the first groove and the second groove respectively.

[0008] One of the embodiments, the second group of piston coil includes a third coil and a fourth coil, the second piston body is provided with third groove and fourth groove which are arranged in upper and lower interval, the third coil and the fourth coil are arranged on the third groove and the fourth groove respectively.

[0009] One of the embodiments, the first sealing ring is arranged between the top cover and the piston rod, and the first sealing ring is an O-shaped sealing ring.

[0010] One of the embodiments, the second sealing ring is arranged between the first piston body and the piston rod, and the second sealing ring is an O-shaped sealing ring.

[0011] One of the embodiments, the cylinder assembly includes a cylinder body, and the piston shell is sleeved with a piston ring matched with the inner side wall of the cylinder body.

[0012] One of the embodiments, the first flow-through hole and / or the second flow-through hole are arc-shaped holes.

[0013] One of the embodiments, the first flow-through hole is provided with four holes and is arranged in uniform interval along the circumferential direction of the top cover, and the second flow-through hole is provided with four holes and is arranged in uniform interval along the circumferential direction of the bottom cover.

[0014] In the utility model, a magneto-rheological damper is also disclosed, which comprises a cylinder assembly and a piston structure.

[0015] After the above technical scheme is adopted, the utility model has the following advantages:

[0016] 1、in the utility model, through setting multiple groups of piston coils and arranging them in upper and lower interval, the piston body is provided with piston coils at both ends, so that the damper is controlled by two groups of coils, the stability and reliability of the damper are increased, the design of multiple groups of piston coils can realize more fine control of current, realize multi-stage control of the magneto-rheological damper, can also expand the damping adjustment range, the low-speed damping can be below 100N, and the maximum damping can also be larger, meanwhile, the structure is simple, the cost is low, and the utility model has good economic applicability, and if one group of piston coils is damaged, the other group can also work independently, thereby increasing the service life of the product.

[0017] 2、By setting the piston body to include a first piston body and a second piston body, and setting the piston coil into two groups, one group is set on the first piston body, and the other group is set on the second piston body, not only can the two groups of piston coils work independently, but also facilitate the simultaneous work of the two groups of piston coils, and also facilitate the setting and installation of the piston coil.

[0018] 3、By setting a groove on the piston body, so as to facilitate the winding and installation of the piston coil, and ensure that the piston coil is tightly wound and not easy to collapse.

[0019] 4、By setting two O-shaped sealing rings, the sealing between the top cover and the piston rod, and the first piston body and the piston rod is ensured, and the magnetorheological liquid is prevented from entering the inside of the piston, so that the magnetorheological liquid and the piston coil can more effectively produce magnetic induction change, thereby more accurately controlling the damping force.

[0020] 5、By sleeving the piston ring on the piston shell, the friction between the piston assembly and the cylinder body is reduced, thereby prolonging the service life.

[0021] 6、By setting the first flow-through hole and / or the second flow-through hole into an arc-shaped hole, and setting four of them in uniform intervals, so as to ensure that the area of the first flow-through hole and the second flow-through hole is large enough, which greatly facilitates the flow of the magnetorheological liquid.

[0022] 7、By applying the above-mentioned piston structure to the magnetorheological damper, the stability and reliability of the magnetorheological damper can be greatly improved, the overall production cost of the damper is low, and it has good economic applicability, and can also increase the adjustable range of damping, the current change is more accurate, and the multi-stage control of the magnetorheological damper can be better realized, and due to the increase of the magnetic field length, the magnetorheological damper can realize more precise damping force adjustment, thereby helping passengers and drivers to obtain a better driving experience. BRIEF DESCRIPTION OF DRAWINGS

[0023] The utility model will be further described below in combination with the drawings:

[0024] Figure 1 It is the three-dimensional structure schematic view of the piston structure of the utility model.

[0025] Figure 2 It is another angle three-dimensional structure schematic view of the piston structure of the utility model.

[0026] Figure 3 It is the sectional view of the piston structure of the utility model.

[0027] Figure 4 It is Figure 3 The enlarged view of A in the middle.

[0028] Figure 5A three-dimensional structure schematic view of the top cover in the piston structure.

[0029] Figure 6 A three-dimensional structure schematic view of the bottom cover in the piston structure.

[0030] The names of the components in the figure are as follows:

[0031] 100, piston rod; 1, piston shell; 2, piston body; 21, first piston body; 211, first groove; 212, second groove; 22, second piston body; 221, third groove; 222, fourth groove; 3, piston coil; 31, first coil; 32, second coil; 33, third coil; 34, fourth coil; 4, top cover; 41, first flow-through hole; 5, bottom cover; 51, second flow-through hole; 6, piston gap; 71, first sealing ring; 72, second sealing ring; 8, piston ring. DETAILED DESCRIPTION

[0032] In order to more clearly illustrate the overall concept of the utility model, the following will be combined with the drawings in the specification to illustrate in an exemplary manner.

[0033] It should be noted that in the following description, many specific details are set forth in order to provide a thorough understanding of the utility model, however, the utility model can also be implemented in other ways different from the description herein, therefore, the protection scope of the utility model is not limited by the specific embodiments disclosed below.

[0034] In addition, in the description of the utility model, it should be understood that the orientation or position relationship indicated by the terms "center", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like is based on the orientation or position relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the utility model.

[0035] In the utility model, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal communication of two elements or the interaction relationship of two elements. However, it is noted that direct connection means that the connection between the two main bodies does not form a connection relationship through an excessive structure, but is connected only through the connecting structure to form an integral whole. For ordinary skilled persons in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0036] In the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be direct contact between the first and second features, or indirect contact through an intermediate medium. In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0037] As shown in Figures 1 to 6 The utility model provides a magneto rheological damper, including cylinder assembly and piston structure, cylinder assembly includes cylinder body, dustproof cover of cylinder body top and bottom cover of cylinder body bottom, piston structure includes piston rod 100 and connects on piston rod 100 piston assembly, piston assembly includes piston shell 1, the piston body 2 of setting in piston shell 1 and the piston coil 3 of setting on piston body 2, two piston coils 3 form a group and are provided with at least two groups, two groups of piston coil 3 are spaced apart along the up and down direction of piston body 2, the piston gap 6 of forming for magneto rheological fluid flow is formed between piston shell 1 and piston body 2, the top end and bottom end of piston shell 1 are equipped with top cover 4 and bottom cover 5, the first flow through hole 41 is equipped on top cover 4, the second flow through hole 51 is equipped on bottom cover 5, the first flow through hole 41, the second flow through hole 51 and piston gap 6 are communicated and set up, through setting multiple groups of piston coil, and spacing up and down, make piston body both ends be equipped with piston coil, make damper be controlled by two groups of coil, increase the stability, reliability of damper, and the design of multiple groups of piston coil can realize more fine control to electric current, realize the multistage control of magneto rheological damper, can also expand the damping adjustment range, low speed damping can reach below 100N, and the maximum damping can also be larger, simultaneously, this structure is simple, and the cost is low, has good economic applicability, still, if in a group of piston coil is damaged, still can work independently through another group, increase the service life of product.

[0038] In the present application, the piston body 2 includes a first piston body 21 and a second piston body 22, and the piston coil 3 includes a first group of piston coils and a second group of piston coils. The first group of piston coils is arranged on the first piston body 21, and the second group of piston coils is arranged on the second piston body 22. This not only allows the two groups of piston coils to work independently, but also facilitates simultaneous operation of the two groups of piston coils, and facilitates the arrangement and installation of the piston coils.

[0039] And, the first group of piston coils includes the first coil 31 and the second coil 32, the first piston body 21 is provided with the first groove 211 and the second groove 212 arranged in an upper and lower interval, the first coil 31 and the second coil 32 are respectively arranged around the first groove 211 and the second groove 212, and the second group of piston coils includes the third coil 33 and the fourth coil 34, the second piston body 22 is provided with the third groove 221 and the fourth groove 222 arranged in an upper and lower interval, the third coil 33 and the fourth coil 34 are respectively arranged around the third groove 221 and the fourth groove 222, by arranging the grooves on the piston body, so as to facilitate the arrangement and installation of the piston coil, and ensure that the piston coil is arranged tightly and is not easy to collapse. Of course, it can be understood that the first coil 31, the second coil 32, the third coil 33 and the fourth coil 34 do not mean that only one coil is arranged, but only the number is arranged, not the number of turns, which is determined according to the specific situation of the shock absorber.

[0040] And, in order to ensure the sealing, a first sealing ring 71 can be arranged between the top cover 4 and the piston rod 100, the first sealing ring 71 is an O-shaped sealing ring, and a second sealing ring 72 is arranged between the first piston body 21 and the piston rod 100, the second sealing ring 72 is an O-shaped sealing ring, by arranging two O-shaped sealing rings, the sealing between the top cover and the piston rod, and the first piston body and the piston rod is ensured, and the magnetic rheological liquid is prevented from entering the inside of the piston, so that the magnetic rheological liquid and the piston coil can more effectively produce magnetic induction change, thereby more accurately controlling the damping force.

[0041] In some embodiments, a piston ring 8 matched with the inner side wall of the cylinder body can also be arranged on the piston shell 1, the piston ring 8 is arranged around the piston shell 1, so as to reduce the friction between the piston assembly and the cylinder body, thereby prolonging the service life.

[0042] In some embodiments, the first flow-through hole 41 and the second flow-through hole 51 can be arc-shaped holes, the first flow-through hole 41 is provided with four and is arranged in a uniform interval along the circumferential direction of the top cover 4, and the second flow-through hole 51 is provided with four and is arranged in a uniform interval along the circumferential direction of the bottom cover 5, so as to ensure that the area of the first flow-through hole and the second flow-through hole is large enough, thereby greatly facilitating the flow of the magnetic rheological liquid.

[0043] Finally, by applying the above-mentioned piston structure to the magnetic rheological shock absorber, the stability and reliability of the magnetic rheological shock absorber can be greatly improved, the overall production cost of the shock absorber is low, it has good economic applicability, the adjustable range of damping can be increased, the current change is more accurate, the multi-stage control of the magnetic rheological shock absorber can be better realized, and due to the increase of the magnetic field length, the magnetic rheological shock absorber can realize more fine damping force adjustment, thereby helping passengers and drivers to obtain a better driving experience.

[0044] In addition to the above preferred embodiments, the technical solutions of the utility model are not limited to the above embodiments, it should be pointed out that the technical solutions of any one embodiment combined with the technical solutions of one or more other embodiments are within the protection scope of the utility model. Although the utility model has been described in detail by general description and specific embodiments above, some modifications or improvements can be made on the basis of the utility model, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the utility model all belong to the protection scope of the utility model.

Claims

1. A piston structure for a magnetorheological vibration damper, characterized in that, The magnetorheological damper includes a cylinder assembly, and the piston structure includes a piston rod and a piston assembly connected to the piston rod. The piston assembly includes a piston shell, a piston body fitted inside the piston shell, and a piston coil fitted on the piston body. Two piston coils form a group and at least two groups are provided. The two groups of piston coils are spaced apart along the vertical direction of the piston body. A piston gap is formed between the piston shell and the piston body for the flow of magnetorheological fluid. The top and bottom ends of the piston shell are respectively provided with a top cover and a bottom cover. The top cover is provided with a first flow hole, and the bottom cover is provided with a second flow hole. The first flow hole, the second flow hole, and the piston gap are connected.

2. The piston structure according to claim 1, characterized in that, The piston body includes a first piston body and a second piston body, and the piston coil includes a first set of piston coils and a second set of piston coils. The first set of piston coils is disposed on the first piston body, and the second set of piston coils is disposed on the second piston body.

3. The piston structure according to claim 2, characterized in that, The first set of piston coils includes a first coil and a second coil. The first piston body is provided with a first groove and a second groove spaced apart vertically. The first coil and the second coil are respectively wound on the first groove and the second groove.

4. The piston structure according to claim 2, characterized in that, The second set of piston coils includes a third coil and a fourth coil. The second piston body is provided with a third groove and a fourth groove spaced apart vertically. The third coil and the fourth coil are respectively wound on the third groove and the fourth groove.

5. The piston structure according to claim 2, characterized in that, A first sealing ring, which is an O-ring, is provided between the top cover and the piston rod.

6. The piston structure according to claim 5, characterized in that, A second sealing ring, which is an O-ring, is provided between the first piston body and the piston rod.

7. The piston structure according to claim 1, characterized in that, The cylinder assembly includes a cylinder body, and a piston ring fitted on the piston housing to mate with the inner wall of the cylinder body.

8. The piston structure according to claim 1, characterized in that, The first flow hole and / or the second flow hole are arc-shaped.

9. The piston structure according to claim 8, characterized in that, The first flow hole has four holes, which are evenly distributed and spaced apart along the circumference of the top cover, and the second flow hole has four holes, which are evenly distributed and spaced apart along the circumference of the bottom cover.

10. A magnetorheological vibration damper, comprising a cylinder assembly and a piston structure, characterized in that, The piston structure is the piston structure described in any one of claims 1 to 9.

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